Tension device for loom shuttles



May 11,1926. 1,584,564

D. W. LANCE Filed July 28, 1925 f Zia" 2 ulk\\\\\\\\ Patented May 11, 1926.

UNITED .STATES YPATENT QFFICE.

DOTRY W. LANCE, OF MQNTICELLO, ARKANSAS.

TENSION DEVICE FOR LOOM SHUTTLES.

Application lled July 28, 1925. Serial No. 46,612.

This invention relates to new and useful improvements in loom shuttles and particularly to tension devices therefor.

One object is to provide a simple device of this character, composed of few parts, and which will provide the proper tension for the thread, while at the same time permitting the kinks and knots to readily pass without interference or breaking of the thread, or slackening of the saine, which would result in loose threads in the selvage.

Another object is to provide a device of this character which may be easily and quickly inserted or removed, and wherein the pressure between the blocks may be varied.

Another object is to provide a tension device of this character wherein the pressure spring is located at the outlet side of the shuttle, whereby danger of breaking of the thread is reduced to a minimum.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawing.

In the drawing:

Figure 1 is a top plan view of the threader end of a shuttle, equipped with the present invention, and partly broken away.

Figure 2 is an enlarged vertical longitudinal central sectional view on the line 2-2 of Figure 1.

Figure 3 is an enlarged vertical transverse sectional view on the line 8-3 of Figure 1.

Figure 4 is an enlarged vertical transverse section of a modilication of the device wherein one of the blocks is formed integrally with one wall of the thread passage.

Figure 5 is atop plan view of a further modification of the threader.

Figure 6 is a vertical transverse section on the line 6-6 of Figure 5.

Figure 7 is an end view of the threader, Figure 4, removed from the shuttle.

Referring particularly to the accompanying dra-wing, 10 represents an end portion of a shuttle in which is properly mounted the threading member 11, and in connection with which the present invention is particularly adapted for use. Formed transversely through the intermediate portion of the threading member 11 is an opening 12, which may be of any contour, that shown being elliptical. Formed longitudinally through the intermediate portion of the member 1l, and

intersecting the transverse opening 12, is a thread passage 13, through which the thread leads from the bobbin 14, and out through the side 'of the shuttle. Disposed in one end of the opening 12 is a. block of material of a shape to easily and loosely iit said opening, and shown at 15, said block being of a thickness to extend approximately one-half way across the thread passage 13, while a similar block 16 is disposed in the other end of the opening and is of a thickness to extend across the other half of said opening, and contact with the inner face of the block 15. In the outer face of the block 16 there is formed a small circular recess 17, within which is secured one end of a coil spring 18. The threading member 11 snugly lits in a recess 19, formed in the upper side of the end of the shuttle, in the usual manner, and against one side wall of this recess the other end of the coil spring 18 bears, and is properly compressed whereby to urge the block 16 against the block 15, with the proper tension with respect to the thread 20, which passes between said blocks.

Attention is directed to the fact that the spring 18 is located on the outlet sideof the shuttle, whereby any tendency of the thread to pull due to the passage of a kink or knot between the blocks 15 and 16, will be effectively compensated for bythe yielding of the block 16. By reason of this arrangement of the spring, the block 16 will be drawn away from the block 15, by the thread, in contradistinction to the unyielding action of the block 15, were this block 15 located at the side where the thread comes through the shuttle.

It will further be noted that the tension device is compose/.l of three parts, the blocks 15 and 16, and the coil spring 18, with the result that the number of parts is reduced to a minimum.

The blocks 15 and 16 may be formed of a vulcanite, hard rubber, glass, porcelain, or other like hard yet smooth surfaced material, which will readily permit the thread to slip therethrough, while at the same time effectively producing the required tension on the thread.

Figure 4 shows a modified form of the device wherein the block 15 is omitted, and a boss 21 formed integrally on the wall of the thread passage, that end portion of the opening 12 being also omitted. The block 1G is urged by the spring' 1S toward the boss, ivhereby to frietionally cooperate with the boss to grip the thread.

Referring particularly to Figures 5 and G, there is shown a modification ot the threader. In said ligures 22 represents a portion oi' a shuttle in Which is formed the threader receiving recess 23. The threader 2l is disposed in said recess and has the right hand portion, as viewed in Figure 6, formed similarly to the other forms, but the other side is formed With a comparatively narrow up- Wardly extending' member Q5, which is disposed in a vertical groove QG, in the adjacent side Wall of the recess 23. The inner vertical face of the member or that face opposite the side in which is formed the block receiving opening 26, is formed with a boss QT? tor cooperation with the spring' pressed block 8. located in the said opening' QG. The use ot less material than the 'form ot Figure is made possible, in the form of Figures 5 and G, the body of the threader having an upper transverse wall 29, provided with a recess 30 through which the thread passes.

What is claimed is:

ln a tension device tor a shuttle. the combination with the recessed end ot' a shuttle and the threading member located therein and having a passage Yfor the thread and alined openings in the opposite walls oi the thread passage, ot a block in one ot said openings bearing` against one vall ot' the recess`r a block in the other opening and hearingT against the tirst block Within said passage to grip a thread therebetween. and a spr e' between the second block and the adjacent wall ot the recess 'tor urging the second block through said openingA into thread gripping cooperation With the first block.

In testimony whereof, I atix my signature.

DOTRY XV. LANCE. 

